s6 edge not reseting

My s6 edge device used to be on sprint and I had it decoded. I noticed it doesn't really reset when I follow the factory reset instructions. It only kinda resets the date. All my pictures and music were still on the phone after I attempted to factory reset it. I also noticed after doing a factory reset the phone doesn't restart with the page to accept terms and conditions and choose language and all that. It just goes off. Phone is not rooted and hasn't been used. Alongside this problem is the very horrible cell standby drain. 68% !

Will flashing the phone help ? Or will it reset the phone back to sprint? I need serious and concrete advice

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